『Abstract
In this paper, the long-term mean annual groundwater recharge
of Taiwan is estimated with the help of a water-balance approach
coupled with the base-flow-record estimation and stable-base-flow
analysis. Long-term mean annual groundwater recharge was derived
by determining the product of estimated long-term mean annual
runoff (the difference between precipitation and evapotranspiration)
and the base-flow index (BFI). The BFI was calculated from daily
streamflow data obtained from streamflow gauging stations in Taiwan.
Mapping was achieved by using geographic information systems (GIS)
and geostatistics. The presented approach does not require complex
hydrogeologic modeling or detailed knowledge of soil characteristics,
vegetation cover, or land-use practices. Contours of the resulting
long-term mean annual P, BFI, runoff, groundwater recharge,
and recharge rates fields are well matched with the topographical
distribution of Taiwan, which extends from mountain range toward
the alluvial plains of the island. The total groundwater recharge
of Taiwan obtained by the employed method is about 18 billion
tons per year.
Keywords: Groundwater recharge; Water balance; Base-flow-record
estimation; Stable-base-flow analysis; Base-flow index』
Introduction
Methodology
Results and discussion
Conclusions
Acknowledgments
References